表面接枝聚乙烯吡咯烷酮的聚乳酸纤维改性

针对聚乳酸（PLA）纤维的强疏水性，对聚乳酸纤维表面接枝聚乙烯吡咯烷酮进行研究。通过万能强力仪、红外光谱仪，扫描电子显微镜对改性聚乳酸纤维进行力学性能和结构的表征，并对纤维水解质量减少率、改性纤维吸水率和接枝率进行测定。结果显示，碱水解和酸水解之后的PLA纤维均成功地接枝聚乙烯吡咯烷酮（PVP）；但是碱水解的聚乳酸纤维接枝PVP的接枝率低于酸水解的聚乳酸纤维；2种接枝PVP的聚乳酸纤维吸水率明显提高，分别是未改性聚乳酸纤维吸水率6.44倍和8.97倍，但是接枝的聚乳酸纤维的力学性能均下降。

Study on surface modification of poly(lactic acid) fiber grafted with polyvinylpyrrolidone

Based on the strong hydrophobicity of polylactic acid (PLA) fiber, the surface modification of PLA fiber grafted with polyvinylpyrrolidone (PVP) was researched. The mechanical properties and structure of modified PLA fibers were characterized by the electronic universal strength testing machine, an infrared spectrometer and a scanning electron microscope. And the weight loss of fiber hydrolysis, water absorption and the grafting ratio of modified PLA fiber were determined. Results showed that PLA fiber after NaOH hydrolysis and acid hydrolysis were successfully grafted by polyvinylpyrrolidone (PVP), while PVP grafting rate of PLA fiber hydrolyzed by NaOH solution was lower than that of PLA fiber hydrolyzed by the acid hydrolysis. The water absorptions of two kinds of PLA fibers with different PVP grafting ration were obviously improved, and were 6.44 times and 8.97 times that of original PLA fiber, respectively. However, the mechanical properties of the modified PLA fiber were declined.